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const data = [{
	Group: 'A',
	Name: 'SD'
}, {
	Group: 'B',
	Name: 'FI'
}, {
	Group: 'A',
	Name: 'MM'
}, {
	Group: 'B',
	Name: 'CO'
}];

let unique = [...new Set(data.map(item => item.Group))];
console.log(unique);